﻿//类名:EcanSecurity
//作用:加密解密
//作者：Guofeng
//时间：2010-12-01

using System;
using System.Text;
using System.Security.Cryptography;
using System.Web.Security;
using System.Security;
using System.Security.Policy;
using System.Configuration;

namespace Config
{
    public static class EcanSecurity
    {
        //string ss = EncodeDES("ss");

        #region DES加密解密
        /// <summary>
        /// DES加密
        /// </summary>
        /// <param name="Text"></param>
        /// <returns></returns>
        public static string EncodeDES(string Text)
        {
            string sKey = "jianghui@158";

            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            byte[] inputByteArray;
            inputByteArray = Encoding.Default.GetBytes(Text);
            des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
            des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            StringBuilder ret = new StringBuilder();
            foreach (byte b in ms.ToArray())
            {
                ret.AppendFormat("{0:X2}", b);
            }

            return ret.ToString();
        }

        /// <summary>
        /// DES解密
        /// </summary>
        /// <param name="Text"></param>
        /// <returns></returns>
        public static string DecodeDES(string Text)
        {
            string sKey = "jianghui@158";

            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            int len;
            len = Text.Length / 2;
            byte[] inputByteArray = new byte[len];
            int x, i;
            for (x = 0; x < len; x++)
            {
                i = Convert.ToInt32(Text.Substring(x * 2, 2), 16);
                inputByteArray[x] = (byte)i;
            }
            des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
            des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();

            return Encoding.Default.GetString(ms.ToArray());
        }
        #endregion

        #region base64加密解密
        /// <summary>
        /// Base64加密
        /// </summary>
        /// <returns>返回string</returns>
        public static string EncodeBase64(string s)
        {
            string strResult = "";

            if ((s != null) && (s != ""))
            {
                strResult = Convert.ToBase64String(ASCIIEncoding.Default.GetBytes(s));
            }

            return strResult;
        }

        /// <summary>
        /// Base64解密
        /// </summary>
        /// <returns>返回string</returns>
        public static string DecodeBase64(string s)
        {
            string strResult = "";

            if ((s != null) && (s != ""))
            {
                strResult = ASCIIEncoding.Default.GetString(Convert.FromBase64String(s));
            }

            return strResult;
        }
        #endregion
    }
}